Industrial production method for red with small precipitation on machine surface and method for detecting precipitation on machine surface
A production method and pigment technology, applied in chemical instruments and methods, organic dyes, color/spectral characteristic measurement, etc., can solve problems such as difficulty in cleaning the machine surface, serious precipitation of pigment on the machine surface, loss of pigment coloring, etc., and achieve equipment Low requirements, short reaction time, and improved dispersibility
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Embodiment 1
[0029] 1) Put 175 Kg of 2-chloro-4-aminotoluene-5-sodium sulfonate into a common reaction kettle, add 2000 Kg of water, raise the temperature to 70°C until completely dissolved, quickly add 215 Kg of 30% hydrochloric acid, and then Add 251Kg of 20% sodium nitrite solution within 10 minutes at 0°C for diazotization and stirring reaction for 1 hour;
[0030] 2) Inject 145 Kg of 3-hydroxy-2-naphthoic acid into the coupling reaction kettle, add 250 Kg of liquid caustic soda with a content of 30%, stir until the 3-hydroxy-2-naphthoic acid is dissolved, and add 35 kg of rosin;
[0031] 3) Add the diazo solution into the coupling reaction kettle at 15°C for coupling reaction, and stir for 2 hours after adding the diazo solution;
[0032] 4) Raise the temperature to 38°C, inject 280 Kg of calcium chloride into the coupling reaction kettle, stir for 1 hour and 15 minutes, then raise the temperature to 95°C for post-treatment, keep the temperature for 30 minutes, cool down and suction f...
Embodiment 2
[0035] 1) Put 175Kg of 2-chloro-4-aminotoluene-5-sulfonic acid into a common reaction kettle, add 2000Kg of water; quickly add 215Kg of 30% hydrochloric acid, and then add 20% sodium nitrite within 20 minutes at 10°C Solution 251Kg carried out diazotization stirring reaction for 2 hours;
[0036] 2) Inject 148Kg of 3-hydroxy-2-naphthoic acid into the coupling reaction kettle, add 255Kg of liquid caustic soda with a content of 30%, and stir until the 3-hydroxy-2-naphthoic acid is dissolved;
[0037] 3) Add the diazo solution into the coupling reaction kettle at 10°C for coupling reaction, stir for 2 hours after adding the diazo solution, and add 17.5kg of S-rosin;
[0038] 4) Raise the temperature to 35°C, inject 350 Kg calcium chloride into the coupling reaction kettle, stir for 30 minutes, heat up to 95°C for post-treatment, keep warm for 10 minutes, cool down and filter, and dry at 90°C to obtain Pigment Red with a weight of 351kg , The application performance of the pigmen...
Embodiment 3
[0040] 1) Put 175Kg of 2-chloro-4-aminotoluene-5-sulfonic acid into a common reaction kettle, add 2000Kg of water; quickly add 215Kg of 30% hydrochloric acid, and then add 20% of nitrous acid within 15 minutes at -2°C Sodium solution 251Kg carried out diazotization stirring reaction for 1 hour;
[0041] 2) Inject 145 Kg of 3-hydroxy-2-naphthoic acid into the coupling reactor, add 250 Kg of liquid caustic soda with a content of 30%, stir until the 3-hydroxy-2-naphthoic acid is dissolved, and add 30 kg of stearic acid;
[0042] 3) Add the diazo solution into the coupling reaction kettle at 15°C for coupling reaction, and stir for 1.5 hours after adding the diazo solution;
[0043] 4) Raise the temperature to 40°C, inject 320Kg of calcium chloride into the coupling reaction kettle, stir for 15 minutes, heat up to 85°C for post-treatment, keep warm for 20 minutes, cool down and filter, and dry at 90°C to obtain Pigment Red with a weight of 359kg. The application performance of th...
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